[MattAMiller]

Bunker busters aren't just big bombs. They're essentially big darts made out of very hard steel that slam into the ground at mach 4. Most of their weight is just digging power. No nuclear bombs necessary.

[Poincare]

Bunker busters aren't just big bombs. They're essentially big darts made out of very hard steel that slam into the ground at mach 4. Most of their weight is just digging power. No nuclear bombs necessary.

Once the proper depth is attained then it is time to let loose a great deal of heat. Thermite-like compounds can do a lot, but a small nuke can do much more. It need not make a hugh disturbance on the surface, e.g. a mushroom cloud. We've had time to develop these bunker busters and we've been aware for some time that Saddam has sought to move WMD production underground.